Support for incandescent-lamp filaments.



A. S. KNIGHT. SUPPORT FOR INGANDESCENT LAMP FILAMENTS. APPLICATION LEILEDJULY 19. 1909. RENEWED MAY 14, 1912.

1,125,121. Patented Jan. 19, 1915.

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'W JERSEY, ASSIGNOR 'lC WESTIEJGHOUSE LAM)? COMPANY A GORPGRATION k KEENN SYLWHLNZA.

Specification of letters Patent;

lofted Jan. 19, 9 15,

eppl'lcation filed July 19, 1969, Serial No. 5615,5422. Renewed May is, 1912. Serial No. 697,303.

T 0 all whom it may concern:

Be it known that I, ARTHUR S. KNXGHT, a. subject of the King of Great Britain, and a resident oi Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Supports for incandescent-Lamp l ilaments, of which the following is a specification.

My invention relates to electric incandes cent lamps and particularly to tubular lamps having straight filaments extending from end to end thereof.

The object or" the invention is to provide 2. lamp of the character indicated that shall 5 embody si epic and effective means for maintaining the filament taut and spproxr mstely central Within the casing.

The use, in incandescent lamps, of very long tungsten, molybdenum or similar metsllic filaments which become pliable and sag under their own weights upon being heated to incsndescence, requires the provision, in such lamps, of means which Wil. maintain the filaments tout under all con ditions, and, at the some time, Will permit of ready expansion and contraction of the illsnients Without subjection to undue sersins. The desired results may be secured, in s. tubular lamp, by dividing filament into sections and placing suituble tension devices between scent sections. The present invention provides an especially advantageous means for performing the desired function and also for supporting the filament opprolstimstely Within, out of on gsgement with, the tubular casing. I v

Figure l of the accompanying drawing is a lamp embodying my inven- 2 is a side View of the tension in the lamp of Fig. 1. Figs. side views of lamps embodyin ons the lamp of Fig. 1, perspective views of the ten.-

in lamps of 3 Figs. 'Y'snd 8 are, edewise views oi 1 device. v ends of a tubular casing bulb l, and arranged in series relation therein, are a plurality of ills merit sections 2 and 3, interposed and con nected between which is supporting and tension device 4 that comprises e. ring"- shaped body portion and inwardly extending e d substsntmlly IElCllELl ens portions 6 and 7 having eyes at their extremities that are connected to the filament sections and are bent to extend elong and in shown. in Fig. 1 may not be found suitable Where a low-resistance connection between the filament sections is desirable or necessary.

In Figs. 8 and l is shown a tension device consisting of s member 4*, that is of substantially the seine-form as that shown in Big. 1 and composed of copper or other material of high conductivity, and a resilient member or spring 8 connected between the portions of. the member i The resilient member or spring 8 consists of s reverse-1y bent strip of material of substantially the form of the letter 8, the extremities of which are provided with hooks for attaching the some to eyes 19 in the end portions 01 the member l".

In Figs. and 6 the resilient memb r is in the form of o helical spring 11, which permits 0t greater range of expansion and contraction than the ti-shaped device of 3 and l i l and 8 illustrate a modification oi. the form of the tension device, shown in w i Q, annular portion 4P thereof toned into oblong form in cross .c LXL This form oi the device is more ll .ziblc and otherwise more suitable for use in some instances than the device of Fig l and 2.

. 1'. claim as my invention:

i. A combined support and connector for clined filament sections in a tubular incandescent electric lamp comprising a member having a. ring shaped body portion fitting the interior oi. the lamp tube, and inwardly struction of the tension device of 1 are else of h gh specific resistance, the device exrending'end portions that are respectively connected to adjacent filament sections.

2. A combined support and connector for alined filament sections in a eubuiar incandescent'electric lamp comprising a member having a ring shaped body portion fitting the interior of the lamp tube, inwardly extending end portions that are respectively connected to adjacent filament sections, and a resilient member interposed between the end portions of the said member.

'3. A combined support and connec'bor for alined filament sections in a tubular incandescent electric lamp comprising a member composed of low-resistance mafieriai, having a ring shaped body portion fitting she in terior oi": the lamp tube, inwardly extending ARTHUP Kill.

Wiinesses:

GEORGE W. Bnnnnn, R. C. KARCHNEZZ, 

